Assembly Manual: MS: SEA 118

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com
MS: SEA 118
ASSEMBLY MANUAL
“Graphics and specifications may change without notice”.
Specifications:
Wing span ----------------------------- 67.7in (172cm).
Wing area ------------------ 779.7sq.in (50.3sq dm).
Weight ------------------------- 8.6-9.7lbs (3.9-4.4kg).
Length -------------------------------- 49.1in (124.6cm).
Engine ----------------.75 - .91cu.in ---------2-stroke.
.91 - 1.00cu.in ------4-stroke.
Radio -------------- 6 channels with 5 digital servos.
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ZLIN 50. Instruction Manual
INTRODUCTION.
Thank you for choosing the ZLIN 50 ARTF by SEAGULL MODELS. The ZLIN 50 was designed
with the intermediate/advanced sport scale in mind. It is a semi scale airplane which is easy to fly
and quick to assemble. The airframe is conventionally built using balsa, plywood to make it stronger
than the average ARTF , yet the design allows the aeroplane to be kept light. You will find that most
of the work has been done for you already. The motor mount has been fitted and the hinges are pre-
installed . Flying the ZLIN 50 is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your ZLIN 50. Use the parts listing below to identify
all parts.
WARNING.
Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it
is capable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU
ASSUME ALL RISK & RESPONSIBILITY.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C
supplier and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be able
to advise on any insurance and safety regulations that may apply.
KIT CONTENTS
1
13
10
4
5 6
2 3
9 8
12 5
7 12
11
8.1 8.2 12 12
12
12 12 12 12 12 12
2
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KIT CONTEN.TS HINGING THE AILERONS.
1 Fuselage Note: The control surfaces, including the

2 Canopy ailerons, elevators, and rudder, are
3 Left wing panel prehinged with hinges installed, but the
4 Right wing panel hinges are not glued in place. It is
5 Tail set imperative that you properly adhere the
6 Aluminum wing tube hinges in place per the steps that follow
7 Scale pilot using a high-quality thin C/A glue.
8 70mm wheels (2)
8.1 Tail wheel gear 1) Carefully remove the aileron from one
8.2 Main landing gear of the wing panels. Note the position of the
9 Wheel pants (2) hinges.
10 Decal sheet
11 EP conversion pack
12 Hardware bag included
13 Fiberglass cowl
ADDITIONAL ITEMS REQUIRED.

.75- .91 cu.in 2-stroke engine
.91- 1.00 cu.in 4-stroke
5 digital servos
Glow plug to suit engine

2) Remove each hinge from the wing panel
Propeller to suit engine
and aileron and place a T-pin in the center of
Protective foam rubber for radio
each hinge. Slide each hinge into the wing
system
panel until the T-pin is snug against the wing
Silicone fuel line
panel. This will help ensure an equal amount
of hinge is on either side of the hinge line when
the aileron is mounted to the aileron.
TOOLS & SUPPLIES NEEDED.
Thick cyanoacrylate glue
30 minute epoxy
5 minute epoxy T- pin.
Hand or electric drill
Assorted drill bits
Modelling knife
Straight edge ruler
2mm ball driver
Phillips head screwdriver
220 grit sandpaper Hinge.
90° square or builder’s triangle
Wire cutters
Masking tape & T-pins
3) Slide the wing panel on the aileron until
Thread-lock
there is only a slight gap. The hinge is now
Paper towels
centered on the wing panel and aileron.
Remove the T-pins and snug the aileron
against the wing panel. A gap of 1/64” or less
should be maintained between the wing panel
and aileron.
3
T- pin.
Hinge.
5) Turn the wing panel over and deflect the

aileron in the opposite direction from the
4)Deflect the aileron and completely
opposite side. Apply thin C/A glue to each
saturate each hinge with thin C/A glue. The
hinge, making sure that the C/A penetrates into
ailerons front surface should lightly contact the
both the aileron and wing panel.
wing during this procedure. Ideally, when the
6) Using C/A remover/debonder and a
hinges are glued in place, a 1/64” gap or less
paper towel, remove any excess C/A glue that
will be maintained throughout the lengh of the
may have accumulated on the wing or in the
aileron to the wing panel hinge line.
aileron hinge area.
The hinge is constructed of a special 7) Repeat this process with the other wing
Note:
material that allows the C/A to wick or panel, securely hinging the aileron in place.
penetrate and distribute throughout the
hinge, securely bonding it to the wood 8) After both ailerons are securely hinged,
structure of the wing panel and aileron. firmly grasp the wing panel and aileron to
make sure the hinges are securely glued and
cannot be pulled out. Do this by carefully
applying medium pressure, trying to separate
the aileron from the wing panel. Use caution
not to crush the wing structure.
Note: Work the aileron up and down several

times to “work in” the hinges and check
for proper movement.
HINGING THE ELEVATOR.

Glue the elevator hinges in place using the
same techniques used to hinge the ailerons.
4
4) Thread a control horn end with aluminum

HINGING THE RUDDER.
washer, lock nut until the top edge of the end is
Glue the rudder hinges in place using the 18mm from the vase of the horn as shown.
same techniques used to hinge the ailerons.
CONTROL HORN
M3 SCREW.
Epoxy.
ALUMINUM WASHER.
M3 LOCK
NUT. ALUMINUM WASHER.
Hinge.
INSTALL THE AILERONS CONTROL HORN.
1) Locate the hardware necessary to install

the control horns for the ailerons. 18mm .
Epoxy.
2 sets.
Aileron control horn.
3x40mm.
2) Position the control horn on the bottom of

the aileron. You will see pre-drill hole 3mm for
the horn mounting screw on the aileron.
Wing
bottom.
INSTALL ELEVATOR CONTROL HORN.

3mm.
Install the elevator control horn using the
same method as same as the aileron control
horns.
2 sets.
3) Place epoxy into hole. This will harden the

threads and prevent the crews from pulling
loose. 3x35mm.
5
INSTALL RUDDER CONTROL HORN.
Repeat steps to install the rudder control horn

as same as steps done for ailerons.
2 sets.
3mm.
3x50mm.
CONTROL HORN M3
Aluminum Washer.
Epoxy.
Horizontal
Stabilizer. Elevator.
Aluminum Washer.
M3 LOCK NUT.
3mm.
Epoxy.
Horizontal CONTROL HORN
Stabilizer. M3 SCREW.
ALUMINUM WASHER.
16mm.
EPOXY.
Rudder
FUSELAGE
ALUMINUM WASHER.
M3 LOCK NUT.
Elevator control horn.
EPOXY.
Rudder.
Fuselage.
18mm.
6
Rudder control horn.
INSTALLING THE BATTERY.

ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install the
engine mount included with your model. . Battery.
Tie Wrap.
M4 x 30mm.
2) Use four 4x30mm head bolts and four 4mm
washers to attach the engine mount rails to INSTALLING THE STOPPER ASSEMBLY.
the firewall. Tighten the screws . Make sure to
1) Using a modeling knife, carefully cut
use threadlock on the screws to help prevent
off the rear portion of one of the 3 nylon tubes
them from vibrating loose.
leaving 1/2” protruding from the rear of the
stopper. This will be the fuel pick up tube.
2) Using a modeling knife, cut one length
of silicon fuel line. Connect one end of the
line to the weighted fuel pick up and the other
end to the nylon pick up tube.(The silicon tube
is not included).
Diameter =5.5mm. 3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
Thread locker glue.
A.
7
FUEL TANK INSTALLATION.
You should mark which tube is the vent

and which is the fuel pickup when you
attach fuel tubing to the tubes in the stopper.
Once the tank is installed inside the fuselage,
it may be difficult to determine which is which.
7) Slide the fuel tank into the fuselage.

Guide the lines from the tank through the hole
in the firewall.
Vent tube. Fuel pick up tube.
Fuel fill tube. A.

C/A glue.
Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
Important: When the stopper assembly is in- 8) Use plywood template to hold in place
stalled in the tank, the top of the vent tube the fuel tank with C/A glue to secure the fuel
should rest just below the top surface of the tank inside the fuselage. To help prevent
tank. It should not touch the top of the tank. moveable from transferring to the fuel tank.
4) Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using a
modeling knife. If flashing is present, make
sure none falls into the tank.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
the rear of the tank and move freely inside the A.
tank. The top of the vent tube should rest just Fuel tank.
below the top of the tank. It should not touch
the top of the tank.
6) When satisfied with the alignment of
the stopper assembly tighten the 3 x 20mm
machine screw until the rubber stopper ex-
pands and seals the tank opening. Do not
overtighten the assembly as this could cause
the tank to split.
8
2) Follow diagram below for wheel pant

installation:
Vent tube.
Use a drill and 4.2mm drill bit to drill a hole in
the wheel pants.
Drill a hole.
4.2mm.
Fuel fill tube.
10mm.
Fuel pick-up tube.
9) Connect the lines from the tank to the

engine and muffler. The vent line will connect
to the muffler and the line from the clunk to the
carburetor.
Blow through one of the lines to ensure

the fuel lines have not become kinked in-
side the fuel tank compartment. Air should 3) You have to trim each axle using a tool
flow through easily. cutting and cut-off wheel.
WHEEL AND WHEEL PANTS Caution when cutting the axles and
INSTALLATION. wear protective goggles.
1) Locate the items neccessary to install
the wheel and wheel pants as shown.
46mm
9
4) Slide the collar to the axle and setscrew

Landing Gear.
the collars to secure the collar to the axle and
then slider the wheel on the axle with a drop of wheel Pant.
oil on the axle so the wheel will spin freely when C/A glue.
installed. Prepare a second collar and tighten
the setscrew using hex wrench to secure the
collar to the axle.
5) Place the wheel assembly in the wheel

pants. The threaded portion of the axle will fit
the notch of the wheel pant as shown.
Lite-Plywood wheel collar.

block.
Axle. M3.
Washer. wheel.
wheel. wheel collar.

Locker glue.
Washer. 7) Tighten the setcrews using a hex

Axle. wrench to secure the collars on the axle over
nut. the flat spot to retain the wheel as shown.
wheel Pant. M3.
Lite-Plywood
block.
6) Slide the threaded end of the axle

through the hole in the bottom of the landing
gear leg. Use a washer and locknut to tighten
the axle to the landing gear. Make sure to use
threadlock on the nut so it won’t vibrate loose
in flight as shown.
10
Repeat steps as above to attach remain- THROTTLE SERVO ARM INSTALLATION.

ing wheel pants to the landing gear.
Install adjustable servo connector in the servo
INSTALLING THE MAIN LANDING GEAR arm as same as picture below:
TO FUSELAGE.
Loctite secure.
8) The blind nuts for securing the landing
Adjustable Servo
gear are already mounted inside the fuselage. connector.
9) Using the hardware provided, mount Servo arm.
the main landing gear to the fuselage.
10) Place the fuselage inverted on the
1 PCS.
workbench in a suitable stand. Set the landing
gear in place and use a screwdrive to secure
the landing gear to the fuselage using bolts
M4x20mm and washers. Make sure to use the
threadlock on the bolts so they don’t vibrate Throttle servo arm.
loose.
Locker glue.
Elevator servo .
Rudder servo .
M4x20mm.
INSTALLING THE SWITCH.

INSTALLING THE FUSELAGE SERVO.
Install the switch into the precut hole in the
Because the size of servos differ, you side of fuselage.
may need to adjust the size of the precut open-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
1) Install the rubber grommets and brass
collets onto the throttle servo. Test fit the servo
into the aileron servo mount.
2) Secure the servos with the screws pro-
vided with your radio system.
Throttle servo . Cut.
Elevator servo .
Rudder servo .
11
4) On the fire wall has the location for the

throttle pusshrod tube (pre-drill).
Switch.
MOUNTING THE ENGINE.
1) Position the engine with the drive washer

(140mm) forward of the firewall as shown.
5) Slide the pushrod tube in the firewall and

guide it through the fuel tank mount. Use
medium C/A to glue the tube to the firewall and
the fuel tank mount.
6) Connect the Z-bend in the 450mm throttle
pushrod to the outer hole of the carburetor arm.
7) Slide the throttle pushrod wire into the tube.

Position the engine between the mounts. Use
140mm. four M4x30mm machine screws to secure the
engine to the mount as shown.
2) Use a pin drill and drill bit to drill a small
indentation in the mount for the engine mounting Pushrod wire.
screw.
Machine Screw M4x30mm.
3) Use a drill to drill the four holes in the engine

mount rails.
4.2 mm diameter.
12
8) Reinstall the servo horn by sliding the

connector over the pushrod wire. Center the
throttle stick and trim and install the servo horn Trim and cut.
perpendicular to the servo center line.
Because of the size of the cowl, it may be nec-

essary to use a needle valve extension for the
9) Move the throttle stick to the closed position high speed needle valve. Make this out of suf-
and move the carburetor to closed. Use a 2.5mm ficient length 1.5mm wire and install it into the
hex wrench to tighten the screw that secures end of the needle valve. Secure the wire in
the throttle pushrod wire. Make sure to use place by tightening the set screw in the side of
threadlock on the screw so it does not vibrate the needle valve.
loose.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
the cowl with the crankshaft of the engine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening. Use the spinner backplate as a guide.
Hold the cowl firmly in place using pieces of
masking tape.
3) Install the muffler and muffler extension

onto the engine and make the cut out in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve. Secure the cowl to fuse-
COWLING INSTALLATION. lage using the M3x10mm screws .
1) Slide the fiberglass cowl over the
engine and line up the back edge of the cowl Needle valve.
with the marks you made on the fuselage then
trim and cut as shown.
Trim and cut.

Machine Screw M3x10mm
.
13
2) Attach the electric motor box to the firewall

Needle valve.
suitable with the cross lines drawn on the electric
motor box and firewall. Using epoxy and balsa
stick to secure the motor box to the firewall.
Please see pictures below.
Epoxy.
ELECTRIC POWER CONVERSION.
1) Locate the items neccessary to install the
electric power conversion included with your
model.
Epoxy.
- Model size: .75-.90 size models

- Motor: 50mm 310 rev per volt
- Propeller: 14x10 ~ 15x10
- ESC: 60A
Balsa block.
- Lipo Batteries: 8 cell 3200mA
14
3) Attach the motor to the front of the electric

Blind nut.
motor box using four 4mm blind nut, four
M4x15mm hex head bolts to secure the motor.
Please see picture shown.
Balsa block.
M4x15mm.
5.2mm.
Epoxy.
4) Locate the plywood battery tray to the
fuselage. Tighten the screws using machine
screws M3x15mm to secure the tray in position.
Battery.
140mm.
Epoxy.
M3x15mm.
5.2mm.
15
5) Attach the speed control to the side of the INSTALLING THE AILERON.
motor box using two-sided tape and tie wraps.
Connect the appropriate leads from the speed
control to the motor. Make sure the leads will Servos. Small weight.
not interfere with the operation of the motor.
speed control.
Thread.
Because the size of servos differ, you

may need to adjust the size of the precut open-
ing in the mount. The notch in the sides of
the mount allow the servo lead to pass through.
1) Using a small weight (Weighted fuel pick-up
works well) and string, feed the string through
the wing as indicated.
SPINNER INSTALLATION.
Install the spinner backplate, propeller and
spinner cone. Small weight. String.
2) Place the servo between the mounting

blocks and space it from the hatch. Use a pencil
Needle valve. to mark the mounting hole locations on the
blocks.
Machine Screw M3x10mm
3) Use drill bit in a pin vise to drill the mouting

holes in the blocks.
The propeller should not touch any part

of the spinner cone. If it does, use a
sharp modeling knife and carefully trim away
the spinner cone where the propeller comes
in contact with it.
16
4) Apply 2-3 drops of thin C/A to each of the

mounting holes. Allow the C/A to cure without
using accelerator.
5) Use dental floss to secure the connection

so they cannot become unplugged.
6) Secure the servo to the aileron hatch using

Phillips screwdriver and the screws provided
with the servo.
7) Apply 1-2 drops of thin C/A to each of the

mounting tabs. Allow the C/A to cure without
using accelerator.
8) A string has been provided in the wing to

pull the aileron lead through to the wing root.
Remove the string from the wing at the servo
location and use the tape to attach it to the
servo extension lead. Pull the lead through the
wing and remove the string.
17
1) Mark the control wire where it crosses the

servo arm hole.
Bend at the mark.
2) Make a 90-degree bend at the mark and cut

off the excess wire leaving 8mm past the bend.
9) Set the aileron hatch in place and use a
Phillips screw driver to install it with four wood M2 lock nut. Metal clevis.
screws.
8mm
Snap keeper.
Servo arm.
Snap keeper.
3) Connect the linkage as shown and secure

AILERON PUSHROD HORN INSTALLATION
the control wire with a snap keeper.
Wing.
Mark.
M3 lock nut.
Pen.
Aileron.
18
Repeat the procedure for the other aileron servo.
WING ASSEMBLY.
1) Locate the items necessary to attach the

wing.
1.
3. 2.
2) Slide the aluminum wing tube into one of

the wing panels. Only slide the tube in as far
as it will easily slide. Forcing the tube could
possibly damage the wing.
4) To help strengthen the wing tube, use

machine screw M3x2.5mm to secure and lock
the wing tube at end of wing tube as position
already marked and predrilled, please see
below pictures.
1.
3) Slide the wings onto the tube and connect

the aileron leads from the wing to the servo 2.5mm.
extension leads from the receiver.
19
Screw.
2.
M3x2.5mm.
C/A glue.
2.
M3x2.5mm. INSTALLING THE HORIZONTAL STABILIZER.
1) Using a ruler and a pen, locate the

centerline of the horizontal stabilizer, at the trail-
ing edge, and place a mark. Use a triangle
and extend this mark, from back to front,
5) Attach the wood washers in place with C/A across the top of the stabilizer. Also extend
glue. this mark down the back of the trailing edge of
the stabilizer.
Center line.
C/A glue.
3.
2) Using a modeling knife, carefully re-
move the covering at mounting slot of horizon-
6) To install the gun onto the wing. Use a hobby tal stabilizer.
knife to cut a slot at the leading edge of the
wing as shown and glue it with C/A glue for
the gun.
Remove the covering.
20
3) Put the stabilizer into place in the po-

sition of the fuselage.
4) Install the stabilizer onto the fuselage.

Align the centerline drawn on the top and the
rear of the stabilizer with the centre of the fu-
Remove covering.
selage. When that is aligned, hold the stabi-
lizer in that position using T-pins or masking
tape. Align the horizontal stabilizer with the
When cutting through the covering to
wing. When viewed from the rear, the hori- remove it, cut with only enough pressure
zontal stabilizer should be level with the wing. to only cut through the covering itself. Cut-
If it is not level, use sandpaper and sand down ting into the balsa structure may weaken
the high side of the stabilizer mounting plat- it.
form until the proper alignment is achieved.
The tips of the stabilizer should also be equal 8) Using a modeling knife, carefully re-
distance from the tips of the wing. move the covering that overlaps the stabilizer
mounting platform sides in the fuselage. Re-
5) When you are satisfied with the align- move the covering from both the top and the
ment, hold the stabilizer in place with T- pins bottom of the platform sides.
or masking tape, but do not glue at this time.
9) When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 Minute Epoxy. Apply a thin layer to the
bottom of the stabilizer mounting area and to
the stabilizer mounting platform sides in the
fuselage. Putting the stabilizer in place and
Hinge slot. realign. Double check all of your measure-
ments once more before the epoxy cures.
Hold the stabilizer in place with T-pins or mask-
ing tape and remove any excess epoxy using
6) With the stabilizer held firmly in place, a paper towel and rubbing alcohol.
use a pen and draw lines onto the stabilizer
where it and the fuselage sides meet. Do this
on both the right and left sides and top and
bottom of the stabilizer.
Epoxy.
Pen.
Epoxy.
7) Remove the stabilizer. Using the lines

you just drew as a guide, carefully remove the
covering from between them using a model-
ing knife.
21
Fill epoxy.
10) After the epoxy has fully cured, re-

move the masking tape or T-pins used to hold
the stabilizer in place. Carefully inspect the
glue joints. Use more epoxy to fill in any gaps
that may exist that were not filled previously
and clean up the excess using a paper towel
and rubbing alcohol.
2) While holding the vertical stabilizer
INSTALLING THE VERTICAL STABILIZER.
firmly in place, use a pen and draw a line on
each side of the vertical stabilizer where it
meets the top of the fuselage.
Masking tape.
Hinge.
1) Using a modeling knife, remove the

covering from over the precut hinge slot cut 3) Slide the vertical stabilizer back in
into the lower rear portion of the fuselage. place. Using a triangle, check to ensure that
the vertical stabilizer is aligned 90º to the hori-
zontal stabilizer.
Vertical
Horizontal 90º Stabilizer.
Stabilizer.
Remove covering.
Tail strut.
22
ELEVATOR - RUDDER PUSHROD HORN

INSTALLATION.
1) Install tail struts included with your ARF.

Cut small slot from the two indentations on
the bottom of the horizontal tail.
Epoxy.
4) When you are sure that everything is

aligned correctly, mix up a generous amount of
Flash 30 Minute Epoxy. Apply a thin layer to the
mounting slot and to bottom of the vertical sta-
bilizer mounting area. Apply epoxy to the bot-
tom and top edges of the filler block and to the
lower hinge also. Set the stabilizer in place
and realign. Double check all of your measure-
ments once more before the epoxy cures. Hold
the stabilizer in place with T-pins or masking
tape and remove any excess epoxy using a
paper towel and rubbing alcohol. Allow the ep-
oxy to fully cure before proceeding.
Cut.
Hinge.
C/A glue.
2) And also cut small slot from the

indentation on both sides of fuselage as
shown.
Cut.
23
3) Attach the tail struts to the both 4) Install the elevator control horn using
horizontal tail and fuselage with C/A glue. the same method as with the aileron control
Please see below pictures for easy installation horns.
the tail struts.
5) Position the elevator control horn on
the both side of elevator.
C/A glue.
6) Thread one clevis and M2 lock nut on
to each elevator control rod. Thread the horns
on until they are flush with the ends of the con-
trol rods.
7) Elevator and rudder pushrods assembly
as pictures below.
Elevator pushrod.
24
Elevator pushrod. Control horn.

M2 lock nut. Metal clevis.

Rudder pushrod. Control horn.
8) With both the rudder servo and rudder

centered, mark the rudder pushrod at the hole
it crosses in the rudder servo arm using a felt-
tipped pen.
A.
A.
9) Enlarge the outer hole in the rudder servo

C/A glue. arm using a drill bit. Bend the pushrod wire at
the mark made in the last step. Pass the wire
through the servo arm and secure it using a
nylon wire keeper. Remove any unused arms
from the servo horn.

A.
C/A glue.
25
8mm. M2 lock nut . M2 clevis.
10) Elevator and rudder pushrods assembly follow pictures below.
2.
1.
2.
1.
11) Install servos arm to servos. Notice MOUNTING THE TAIL WHEEL.
the position of the servo arms on the servos.
See picture below. Locate items necessary to install tail gear.
1. M3 x 12mm.
Throttle.
Elevator.
2.
Rudder.
26
Rudder pushrod.
Cut.
Elevator pushrod. 1. 2.
1) Set the tail wheel assembly in place on INSTALLTION PILOT AND CANOPY.
the plywood plate. The pivot point of the tail 1) Locate items necessary to install pilot,
wheel wire should be even with the rudder cockpit panel, and canopy.
hinge line and the tail wheel bracket should
be centered on the plywood plate.
2) Using a pen, mark the locations of the 1.
two mounting screws. Remove the tail wheel
bracket and drill 1mm pilot holes at the loca-
tions marked.
3) Secure the tail wheel bracket in place
using two M3 x 12mm wood screws. Be care-
ful not to overtighten the screws.
2. 3. 4.
2) A scale pilot is included with this ARF. The

Seagull Pilot included fitting well to the cockpit.
(or you can order others scale pilot figures
made by Seagull factory. They are available at
Seagull distributors.)
If you are going to install a pilot figure, please
use a sanding bar to sand the base of the figure
so that it is flat.
3) Position the pilot figure on the canopy floor
as show. Locate the oval shaped on the canopy
floor and remove the covering. Use epoxy to
glue this into the base of the pilot figure and
glue the cockpit panel in place with C/A glue,
1
please see pictures as shown.
C/A glue.
2 Epoxy. 2.
3.
M3 x 12mm.
10mm.
27
4) Position the canopy onto the fuselage. Trace

INSTALLING THE BATTERY-RECEIVER.
around the canopy and onto the fuselage using
a felt-tipped pen. 1) Plug the five servo leads and the switch
- Apply a bead of canopy glue around the inside lead into the receiver. Plug the battery pack
edge of the canopy. Position the canopy onto lead into the switch also.
the hatch. Use tape to hold the canopy secure
until the glue fully cures. 2) Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration.
3) Route the antenna in the antenna tube

inside the fuselage and secure it to the bot-
tom of fuselage using a plastic tape.
Receiver.
5) Install the canopy and secure it with M2x6mm

screws.
1.
C/A glue.
4) The last detail is to install the antenna

onto the fuselage. Use a hobby knife to cut a
slot in the top of the fuselage for the antenna.
4.
M2x6mm.
APPLY THE DECALS.
1) If all the decals are precut and ready to

stick. Please be certain the model is clean and
free from oily fingerprints and dust. Position
decal on the model where desired, using the
photos on the box and aid in their location.
2) If all the decals are not precut, please use

scissors or a sharp hobby knife to cut the
decals from the sheet. Please be certain the
model is clean and free from oily fingerprints
and dust. Position decal on the model where
desired, using the photos on the box and aid
in their location.
5) Tighten the antenna to the fuselage.

The antenna is removeable so you can install
it at the flying field to prevent damage in trans-
porting.
28
BALANCING.
Tighten the antenna. 1) It is critical that your airplane be
balanced correctly. Improper balance will
cause your plane to lose control and crash.
THE CENTER OF GRAVITY IS LOCATED
95 MM BACK FROM THE LEADING EDGE
OF THE WING AT THE WING ROOT.
2) Mount the wing to the fuselage. Using a
couple of pieces of masking tape, place them
on the top side of the wing 95 mm back from
the leading edge of the wing at the wing root.
3) Turn the airplane upside down. Place
your fingers on the masking tape and carefully
ATTACHMENT WING TO FUSELAGE. lift the plane .
Use the two wing bolts to attach the wing to
the fuselage. Make sure the distance between Accurately mark the balance point on the top
a point centered at the rear of the fuselage and of the wing on both sides of the fuselage. The
each wing tip. The measurement will be equal balance point is located 95 mm back from the
if the wing is aligned correctly. If the measure- leading edge of the wing at the wing root. This
ment is not the same, slightly the hole for the is the balance point at which your model
wing bolts until an equal measurement is should balance for your first flights. Later, you
achieved. may wish to experiment by shifting the balance
up to 10mm forward or back to change the
flying characteristics. Moving the balance
forward may improve the smoothness and
Wing bolt. arrow- like tracking, but it may then require
more speed for take off and make it more
difficult to slow down for landing. Moving the
balance aft makes the model more agile with
a lighter and snappier ”feel”. In any case,please
start at the location we recommend .
With the wing attached to the fuselage, all
parts of the model installed ( ready to fly), and
empty fuel tanks, hold the model at the
marked balance point with the stabilizer level.
Lift the model. If the tail drops when you lift,
the model is “tail heavy” and you must add
weight* to the nose. If the nose drops, it is
“nose heavy” and you must add weight* to the
tail to balance.
*If possible, first attempt to balance the model

by changing the position of the receiver battery
and receiver. If you are unable to obtain good
balance by doing so, then it will be necessary
to add weight to the nose or tail to achieve the
proper balance point.
29
CONTROL THROWS.
Ailerons: 12mm - 15mm up.

95 mm. 12mm - 15mm down.
Elevator: 10mm - 12mm up.

10mm - 12mm down.
Rudder: 20mm - 30mm left.

20mm - 30mm right.
FLIGHT PREPARATION.
E) Check the throttle. Moving the throttle
A) Check the operation and direction of stick forward should open the carburetor bar-
the elevator, rudder, ailerons and throttle. rel. If it does not, flip the servo reversing switch
on your transmitter to change the direction.
B) Plug in your radio system per the
manufacturer's instructions and turn every-
F) From behind the airplane, look at the
thing on.
aileron on the right wing half. Move the aileron
stick to the right. The right aileron should move
C) Check the elevator first. Pull back on
up and the other aileron should move down. If
the elevator stick. The elevator halves should
it does not, flip the servo reversing switch on
move up. If it they do not, flip the servo re-
your transmitter to change the direction.
versing switch on your transmitter to change
the direction.
D) Check the rudder. Looking from be-

hind the airplane, move the rudder stick to the
right. The rudder should move to the right. If it
does not, flip the servo reversing switch on
your transmitter to change the direction.
30
PREFLIGHT CHECK. 5) If your radio transmitter is equipped

with dual rate switches double check that they
1) Completely charge your transmitter are on the low rate setting for your first few
and receiver batteries before your first day of flights.
flying.
6) Check to ensure the control surfaces
2) Check every bolt and every glue joint are moving the proper amount for both low
in the ZLIN 50 to ensure that everything is and high rate settings.
tight and well bonded.
7) Check the receiver antenna. It should
3) Double check the balance of the air- be fully extended and not coiled up inside the
plane. Do this with the fuel tank empty. fuselage.
4) Check the control surfaces. All should
8) Properly balance the propeller. An out
move in the correct direction and not bind in
of balance propeller will cause excessive vi-
any way.
bration which could lead to engine and/or air-
frame failure.
We wish you many safe and enjoyable

flights with your ZLIN 50.
31

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KIT CONTEN.TS HINGING THE AILERONS.

1 Fuselage Note: The control surfaces, including the

ADDITIONAL ITEMS REQUIRED.

Glow plug to suit engine

5) Turn the wing panel over and deflect the

Note: Work the aileron up and down several

HINGING THE ELEVATOR.

4) Thread a control horn end with aluminum

INSTALL THE AILERONS CONTROL HORN.

1) Locate the hardware necessary to install

Aileron control horn.

2) Position the control horn on the bottom of

INSTALL ELEVATOR CONTROL HORN.

3) Place epoxy into hole. This will harden the

INSTALL RUDDER CONTROL HORN.

Repeat steps to install the rudder control horn

Elevator control horn.

Rudder control horn.

INSTALLING THE BATTERY.

Thread locker glue.

FUEL TANK INSTALLATION.

You should mark which tube is the vent

7) Slide the fuel tank into the fuselage.

Vent tube. Fuel pick up tube.

Fuel fill tube. A.

2) Follow diagram below for wheel pant

9) Connect the lines from the tank to the

Blow through one of the lines to ensure

4) Slide the collar to the axle and setscrew

5) Place the wheel assembly in the wheel

Lite-Plywood wheel collar.

wheel. wheel collar.

Washer. 7) Tighten the setcrews using a hex

wheel Pant. M3.

6) Slide the threaded end of the axle

Repeat steps as above to attach remain- THROTTLE SERVO ARM INSTALLATION.

INSTALLING THE SWITCH.

Throttle servo . Cut.

4) On the fire wall has the location for the

MOUNTING THE ENGINE.

1) Position the engine with the drive washer

5) Slide the pushrod tube in the firewall and

7) Slide the throttle pushrod wire into the tube.

Machine Screw M4x30mm.

3) Use a drill to drill the four holes in the engine

8) Reinstall the servo horn by sliding the

Because of the size of the cowl, it may be nec-

3) Install the muffler and muffler extension

Trim and cut.

2) Attach the electric motor box to the firewall

- Model size: .75-.90 size models

3) Attach the motor to the front of the electric

Because the size of servos differ, you

2) Place the servo between the mounting

Machine Screw M3x10mm